TOXNET (TOXicology Data NETwork) is a cluster of databases covering toxicology, hazardous chemicals, environmental health and related areas. TOXNET API offers a RESTful Web Service API that allows users to search TOXNET databases with keywords. Using this API, software developers can integrate TOXNET data into their own applications. For chemical databases, this service accepts keyword searches in a specified database and returns search results in TOXNET API Response Format and full chemical records in HTML format. For bibliographic databases, this service provides keyword searches in a specified bibliographic database and returns search results with bibliographic brief records and bibliographic full records in TOXNET API Response Format. For convenience, a bibliographic full record can be returned in HTML format if requested.